问题描述
我需要创建一个将教师添加到数据库的表单。首先，用户从列表（/ ChoiceType）中选择一个地区，然后从以下列表中选择该地区的城市，大学，最后输入学院的名称。默认值为数据库中的第一个区域，其第一座城市和第一所大学。 发送带有默认数据的页面有效，选择区域，但是城市选择返回500状态
表格：
树枝和ajax：
{% extends 'admin/insert/insert.html.twig' %}
{% block title %}Add Faculty{% endblock %}
{% block body %}
<div class="insert">
<h1 class="insert__title">Add Faculty</h1>
{{ form_start(insert_faculty,{ 'attr' : {'class' : 'insert__form'} }) }}
{% for message in app.flashes('success') %}
<div class="insert__success">
{{ message }}
</div>
{% endfor %}
<div class="insert__errors">
{{ form_errors(insert_faculty) }}
</div>
{{ form_label(insert_faculty.region,'Region:',{ 'label_attr' : {'class' : 'insert__label'} }) }}
{{ form_widget(insert_faculty.region,{ 'attr' : {'class' : 'insert__input'} }) }}
{{ form_label(insert_faculty.city,'City:',{ 'label_attr' : {'class' : 'insert__label'} }) }}
{{ form_widget(insert_faculty.city,{ 'attr' : {'class' : 'insert__input'} }) }}
{{ form_label(insert_faculty.university,'University:',{ 'label_attr' : {'class' : 'insert__label'} }) }}
{{ form_widget(insert_faculty.university,{ 'attr' : {'class' : 'insert__input'} }) }}
{{ form_label(insert_faculty.name,'Name:',{ 'label_attr' : {'class' : 'insert__label'} }) }}
{{ form_widget(insert_faculty.name,{ 'attr' : {'class' : 'insert__input insert__input_name'} }) }}
<button type="submit" class="insert__button">Save</button>
{{ form_end(insert_faculty) }}
<div class="insert__buttons">
<a href="{{ path('insert') }}" class="insert__button">Back</a>
</div>
</div>
{% block javascripts_footer %}
{{ parent() }}
<script>
let $region = $('#insert_faculty_region');
$region.change(function() {
let $form = $(this).closest('form');
let data = {};
data[$region.attr('name')] = $region.val();
$.ajax({
url : $form.attr('action'),type: $form.attr('method'),data : data,success: function(get) {
$('#insert_faculty_city').html(
$(get).find('#insert_faculty_city').html()
);
$('#insert_faculty_university').html(
$(get).find('#insert_faculty_university').html()
);
}
});
});
let $city = $('#insert_faculty_city');
$city.change(function() {
let $form = $(this).closest('form');
let data = {};
data[$city.attr('name')] = $city.val();
$.ajax({
url : $form.attr('action'),success: function(get) {
$('#insert_faculty_university').html(
$(get).find('#insert_faculty_university').html()
);
}
});
});
</script>
{% endblock %}
{% endblock %}
表单类：
class InsertFacultyType extends AbstractType
{
public function buildForm(FormBuilderInterface $builder,array $options)
{
$builder
->add('region',ChoiceType::class,[
'choices' => $options['regions_array'],'mapped' => false,])
->add('city',[
'choices' => null,])
->add('university',])
->add('name')
;
$formModifier = function (FormInterface $form,$entity_parent) {
if (get_class($entity_parent) === 'App\Entity\Region') {
if (!$entity_parent->getCities()->count()) {
$form->add('city',[
'choices' => null,]);
}
else {
$cities_in_database = $entity_parent->getCities();
foreach ($cities_in_database as $city) {
$cities[$city->getName()] = $city;
}
$form->add('city',[
'choices' => $cities,]);
}
}
else if (get_class($entity_parent) === 'App\Entity\City') {
if (!$entity_parent->getUniversities()->count()) {
$form->add('university',]);
}
else {
$university_in_database = $entity_parent->getUniversities();
foreach ($university_in_database as $university) {
$universities[$university->getName()] = $university;
}
$form->add('university',[
'choices' => $universities,]);
}
}
};
$builder->addEventListener(
FormEvents::PRE_SET_DATA,function (FormEvent $event) use ($options,$formModifier,$builder) {
$region = $options['regions_array'][array_key_first($options['regions_array'])];
$city = $region->getCities()[0];
$formModifier($event->getForm(),$region);
$formModifier($event->getForm(),$city);
}
);
$builder->get('region')->addEventListener(
FormEvents::POST_SUBMIT,function (FormEvent $event) use ($formModifier) {
$region = $event->getForm()->getData();
$city = $region->getCities()[0];
$formModifier($event->getForm()->getParent(),$region);
$formModifier($event->getForm()->getParent(),$city);
}
);
$builder->get('city')->addEventListener(
FormEvents::POST_SUBMIT,function (FormEvent $event) use ($formModifier) {
$city = $event->getForm()->getData();
$formModifier($event->getForm()->getParent(),$city);
}
);
}
public function configureOptions(OptionsResolver $resolver)
{
$resolver->setDefaults([
'data_class' => Faculty::class,'regions_array' => null,]);
$resolver->setAllowedTypes('regions_array','array');
}
}
控制器：
/**
* @Route("/admin/insert/faculty",name="faculty")
*/
public function faculty(Request $request)
{
$regions_in_database = $this->getDoctrine()->getRepository(Region::class)->findAll();
$regions = [];
foreach ($regions_in_database as $region) {
$regions[(string)$region->getName()] = $region;
}
$faculty = new Faculty();
$insert_faculty = $this->createForm(InsertFacultyType::class,$faculty,[
'regions_array' => $regions,]);
if (!$regions_in_database) {
$insert_faculty->addError(new FormError("There are no regions!"));
}
$insert_faculty->handleRequest($request);
if ($insert_faculty->isSubmitted() && $insert_faculty->isValid()) {
$repository = $this->getDoctrine()->getRepository(University::class);
$faculty_in_database = $repository->findOneBy(
[
'name' => $faculty->getName(),'university' => $faculty->getUniversity(),]
);
if ($faculty_in_database) {
$insert_faculty->addError(new FormError('Such a faculty is already in the database!'));
}
else {
$faculty->setrating(0);
if(!$faculty->getUniversity()) {
$insert_faculty->addError(new FormError("Select the university!"));
}
else {
$entity_manager = $this->getDoctrine()->getManager();
$entity_manager->persist($faculty);
$entity_manager->flush();
$this->addFlash(
'success','Faculty "' . $faculty->getName() . '" successfully saved!'
);
}
}
}
return $this->render('admin/insert/faculty/faculty.html.twig',[
'insert_faculty' => $insert_faculty->createView(),]);
}
解决方法
我邀请您使用Symfony调试工具栏。它将使您看到与代码相关的各种问题，并提供有关出现的问题的更多信息。
关于您的问题，我认为有必要在表单发送到应用程序的级别进行调试。但是，如果您需要更多帮助，则必须提供500错误附带的错误消息。